The type of relationship where the cause must be present for the effect to occur is called the: cause-and-effect relationship.
A cause-and-effect relationship can be defined as a relationship of two events in which one event, which is referred to as the "cause" makes another event, which is referred to as the "effect" to occur.
This means that, for one event to happen, the other event must happen. Invariably, if one event doesn't happen, the other cannot.
An example of cause-and-effect relationship is: the effect of crude oil spillage in water bodies on plants and animals.
The "cause" is: crude oil spillage on water bodies.
The "effect" is: the death of plants and animals in the aquatic bodies.
Thus, the type of relationship where the cause must be present for the effect to occur is called the: cause-and-effect relationship.
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